Throne of Thorns

In the decadent Valerian dynasty, matriarch Elinor raises her son Julian to possess his sister Isabel in the name of preserving the family bloodline. Once a fragile caged bird, Isabel learns to weaponize her beauty and intelligence, outmaneuvering her mother, uncle Victor, and father Adrian to seize control of the family empire. But the throne turns her cold, paranoid, and addicted to control, and she imprisons Julian at her side. When her enemies strike back and her empire begins to collapse, Julian and Adrian try to save her from the monster she has become. Their final confrontation ends with Isabel accidentally killing Julian—and choosing to destroy herself rather than live with the truth.